CRASH in raw2trace module mapping when VDSO in between segments of a library

With a proprietary app we're seeing crashes running opcode_mix. It turns out to be from ld-2.27.so with segments spanning the VDSO:

 24,  24, 0x0000ffffbd3cc000, 0x0000ffffbd3ed000, 0x0000ffffbd3d0900, 0000000000000000, v#1,0, ld-2.27.so
 25,  24, 0x0000ffffbd3fc000, 0x0000ffffbd3fe000, 0x0000ffffbd3d0900, 0000000000020dd0, v#1,0, ld-2.27.so
 26,  24, 0x0000ffffbd40d000, 0x0000ffffbd410000, 0x0000ffffbd3d0900, 0000000000021750, v#1,0, ld-2.27.so
 27,  27, 0x0000ffffbd40c000, 0x0000ffffbd40d000, 0x0000ffffbd40c300, 0000000000000000, v#1,4096

  last_trace_module_start = 0xffffbd3cc000,
  last_trace_module_size = 0x44000,
  last_mapped_module_start = 0x7ffde94f4000

  modvec_ = std::vector of length 28, capacity 32 = {{            
  <...>
    }, {                        
      path = 0x54bb2dfcd588,  
      orig_base = 0xffffbd3cc000,
      map_base = 0x7ffde94f4000,
      map_size = 0x44000,                           
      is_external = 0x0          
    }, {                        
      path = 0x54bb2dfcd7c0, 
      orig_base = 0xffffbd3cc000,
      map_base = 0x7ffde94f4000, 
      map_size = 0x0,                     
      is_external = 0x0          
    }, {                                            
      path = 0x54bb2dfcd9f8,
      orig_base = 0xffffbd3cc000, 
      map_base = 0x7ffde94f4000, 
      map_size = 0x0,        
      is_external = 0x0 
    }, {                         
      path = 0x54bb2dfcdc30,
      orig_base = 0xffffbd40c000, 
      map_base = 0x54bb39395e94,
      map_size = 0x1000, 
      is_external = 0x1       
    }},                                                           
  last_orig_base_ = 0xffffbd3cc000,
  last_map_size_ = 0x44000,
  last_map_base_ = 0x7ffde94f4000,

(gdb) p/x 0xffffbd3cc000 + 0x44000 
$6 = 0xffffbd410000

So it is a bug in raw2trace handling an .so with separated segments with VDSO in between them. Surprising, since we put in effort to have per-segment instead of per-library module entries, and since DR's core has had several fixes to support things in ELF gaps in years past.